Tonight, tensions higher than ever in the race for the white house just days before voters head to the polls. In Dayton, Ohio, today, this moment of panic at a Donald Trump rally. Secret service agents rushing to his side after a protester tried to rush the stage. It comes after that chaos in Chicago, violent clashes between protesters and supporters inside that auditorium. The event abruptly canceled. Hundreds of demonstrators outside, too. Two police officers injured. And tonight, Donald Trump taking no responsibility for any of it. The reaction from his rivals on the campaign trail fierce. ABC's David Wright starts us off at tonight's trump rally in Kansas City. Reporter: Tonight, tensions on the trail are flaring up. Donald Trump just finished scolding one protester in Dayton, Ohio. I have to do it myself. Reporter: When another leapt over the barricade. Watch there, as the second protester rushes the podium. The secret service, instinctively flanks the candidate as agents subdue the protester. He's now been booked for disorderly conduct. Thank you for the warning. I was ready for him. But it's much easier if the cops do it, don't we agree? What a great job. Reporter: The trump campaign was already on edge today. After the melee last night in Chicago. Trump haters filtered in the arena. Vent on disruption. Donald Trump is not welcome in Chicago. We're going to make that clear. Reporter: Trump canceled the rally. Provoking a violent reaction from trump supporters. All: We want trump! Reporter: Fistfights. A police officer seen bloodied. Today trump didn't back down. Calling the protesters thugs and communists. Some represented Bernie our communist friend. Or they have organized professionally staged wise guys. We got to fight back. Reporter: The tensions simmering for months, have reached a boiling point. The rhetoric, increasingly violent. The candidate, sometimes egging on supporters, urging them to take on the protesters. I'd like to punch him in the face, I tell Ya. Knock the crap out of him. Would you? Seriously. Donald Trump has created a toxic environment, and a toxic environment has allowed his supporters and those who sometimes who seek confrontation to come together in violence. Reporter: Today, Marco Rubio was asked if he'd still support the gop ticket if trump is the nominee. I don't know. It's getting harder every day. Reporter: Here in Kansas City, Missouri, tonight, another big trump rally planned. Heavy security inside the venue right now. All calm so far. But outside, the trump supporters and the trump haters are taunting each other.

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